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DateThu, 13 Aug 2009 16:26:40 +0900
FromDaisuke Nishimura <>
SubjectRe: [PATCH][mmotm] Help Root Memory Cgroup Resource Counters Scale Better (v5)
> @@ -1855,9 +1883,14 @@ __mem_cgroup_uncharge_common(struct page *page, enum charge_type ctype)
> break;
> }
>
> - res_counter_uncharge(&mem->res, PAGE_SIZE, &soft_limit_excess);
> - if (do_swap_account && (ctype != MEM_CGROUP_CHARGE_TYPE_SWAPOUT))
> - res_counter_uncharge(&mem->memsw, PAGE_SIZE, NULL);
> + if (!mem_cgroup_is_root(mem)) {
> + res_counter_uncharge(&mem->res, PAGE_SIZE, &soft_limit_excess);
> + if (do_swap_account &&
> + (ctype != MEM_CGROUP_CHARGE_TYPE_SWAPOUT))
> + res_counter_uncharge(&mem->memsw, PAGE_SIZE, NULL);
> + }
> + if (ctype == MEM_CGROUP_CHARGE_TYPE_SWAPOUT && mem_cgroup_is_root(mem))
> + mem_cgroup_swap_statistics(mem, true);
Hmm, if we don't count MEM_CGROUP_STAT_SWAPOUT properly about other groups than the root,
memsw.usage_in_bytes of the root would be incorrect in use_hierarchy==1 case, right?

> mem_cgroup_charge_statistics(mem, pc, false);
>
> ClearPageCgroupUsed(pc);

Thanks,
Daisuke Nishimura.


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